Temperatura aerului dintr‑o cameră de volum V = 40 m3 este t1 = 25 °C. În cameră se aduce un vas de capacitate calorică C = 400 J/K, ce conține o masă de gheață m = 500 g, la temperatura t2 = –10 °C. Considerând sistemul izolat, căldura specifică a gheții cg = 2 100 J/kg·K, căldura specifică a aerului c = 1 006 J/kg·K, densitatea medie a aerului rho = 1,29 kg/m3, determină temperatura aerului din cameră la stabilirea echilibrului termic.
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Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward
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The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.
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Herman is walking his pet fish, leo , back and forth along the canal. suppose the canal is 30 meters long and he goes up and back 25 times. a) what distance has herman walked?
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Temperatura aerului dintr‑o cameră de volum V = 40 m3 este t1 = 25 °C. În cameră se aduce un vas de...
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